Investments - Summary of Owned Real Estate Activity (Footnote) (Details) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2020
USD ($)
|
Dec. 31, 2019
USD ($)
Property
|
Dec. 31, 2018
USD ($)
|
|
| Real Estate [Line Items] | |||
| Revenue producing capitalized expenditures | $ 10,000 | $ 45,000 | |
| Net investments | 5,943,530 | 5,468,563 | |
| Intangible lease liabilities, net | (121,902) | (127,335) | |
| Net balance | 5,821,628 | ||
| Non-revenue producing capitalized maintenance expenditures | 2,500 | 4,600 | |
| Held-for-use | |||
| Real Estate [Line Items] | |||
| Gain on disposal of assets for properties | 10,200 | 26,500 | $ 1,400 |
| Held-for-sale | |||
| Real Estate [Line Items] | |||
| Gain on disposal of assets for properties | $ 14,200 | 32,400 | $ 13,000 |
| Deed-In-Lieu Properties | |||
| Real Estate [Line Items] | |||
| Amount of disposition of real estate | $ 800 | ||
| Number of properties disposed | Property | 1 | ||